7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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GHSA-jwpw-q68h-r678

GHSA-jwpw-q68h-r678: Duplicate Advisory: Improper Neutralization of CRLF Sequences in dio

Duplicate advisory

This advisory has been withdrawn because it is a duplicate of GHSA-9324-jv53-9cc8. This link is maintained to preserve external references.

Original Description

The dio package prior to 5.0.0 for Dart allows CRLF injection if the attacker controls the HTTP method string, a different vulnerability than CVE-2020-35669.

(GitHub Advisory)

Miggo Vulnerability Database

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GHSA-jwpw-q68h-r678

GHSA-jwpw-q68h-r678:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
dio	pub	< 5.0.0	5.0.0

Technical Details

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Root Cause Analysis

The vulnerability stems from improper validation of the HTTP method parameter before constructing requests. The pre-patch version of _transformData() in dio_mixin.dart directly used user-controlled method strings from RequestOptions without sanitization. This allowed injection of CRLF sequences (\r\n) in the method parameter, which would be interpreted as HTTP header separators when serialized into the request. The fix added _isValidToken() validation specifically to check for RFC-compliant method tokens before processing, confirming this was the vulnerable entry point. The GitHub issue demonstrates how controlled method strings could manipulate HTTP request structure, and the commit directly addresses this by adding validation at this location.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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